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Leases - Summary of Components of Right of Use Assets (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Leases [Line Items] |  |
Opening balance | kr 6,320 |
Depreciation | (2,179) | kr (2,427)
Impairment losses | (99) | (154)
Closing balance | 6,487 | 6,320
Cost [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 17,072 | 17,196
Additions | 2,560 | 1,565
Balances regarding acquired/divested business | (31) | 2
Terminations | (2,064) | (1,359)
Translation differences | 639 | (332)
Closing balance | 18,176 | 17,072
Accumulated depreciation and amortization [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (9,853) | (8,556)
Depreciation | (2,179) | (2,427)
Balances regarding acquired/divested business | 31 | 0
Terminations | 1,673 | 919
Translation differences | (350) | 211
Closing balance | (10,678) | (9,853)
Accumulated impairment losses [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (514) | (374)
Impairment losses | (99) | (154)
Terminations | 47 | 3
Translation differences | (24) | 11
Closing balance | (590) | (514)
Financial sublease [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (385) | (396)
Derecognition for sublease | 0 | (2)
Translation differences | (36) | 13
Closing balance | (421) | (385)
Real estate [Member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 5,985 |
Closing balance | 6,123 | 5,985
Real estate [Member] | Cost [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 16,003 | 15,895
Additions | 2,295 | 1,307
Balances regarding acquired/divested business | (31) | 2
Terminations | (1,794) | (870)
Translation differences | 606 | (331)
Closing balance | 17,079 | 16,003
Real estate [Member] | Accumulated depreciation and amortization [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (9,180) | (7,789)
Depreciation | (1,950) | (2,146)
Balances regarding acquired/divested business | 31 | 0
Terminations | 1,421 | 546
Translation differences | (328) | 209
Closing balance | (10,006) | (9,180)
Real estate [Member] | Accumulated impairment losses [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (453) | (374)
Impairment losses | (99) | (93)
Terminations | 47 | 3
Translation differences | (24) | 11
Closing balance | (529) | (453)
Real estate [Member] | Financial sublease [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (385) | (396)
Derecognition for sublease | 0 | (2)
Translation differences | (36) | 13
Closing balance | (421) | (385)
Vehicles [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 280 |
Closing balance | 344 | 280
Vehicles [member] | Cost [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 769 | 998
Additions | 265 | 257
Balances regarding acquired/divested business | 0 | 0
Terminations | (270) | (489)
Translation differences | 22 | 3
Closing balance | 786 | 769
Vehicles [member] | Accumulated depreciation and amortization [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (489) | (629)
Depreciation | (190) | (232)
Balances regarding acquired/divested business | 0 | 0
Terminations | 252 | 373
Translation differences | (15) | (1)
Closing balance | (442) | (489)
Vehicles [member] | Accumulated impairment losses [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 0 | 0
Impairment losses | 0 | 0
Terminations | 0 | 0
Translation differences | 0 | 0
Closing balance | 0 | 0
Vehicles [member] | Financial sublease [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 0 | 0
Derecognition for sublease | 0 | 0
Translation differences | 0 | 0
Closing balance | 0 | 0
Other [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 55 |
Closing balance | 20 | 55
Other [member] | Cost [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 300 | 303
Additions | 0 | 1
Balances regarding acquired/divested business | 0 | 0
Terminations | 0 | 0
Translation differences | 11 | (4)
Closing balance | 311 | 300
Other [member] | Accumulated depreciation and amortization [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (184) | (138)
Depreciation | (39) | (49)
Balances regarding acquired/divested business | 0 | 0
Terminations | 0 | 0
Translation differences | (7) | 3
Closing balance | (230) | (184)
Other [member] | Accumulated impairment losses [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | (61) | 0
Impairment losses | 0 | (61)
Terminations | 0 | 0
Translation differences | 0 | 0
Closing balance | (61) | (61)
Other [member] | Financial sublease [member] |  |
Disclosure Of Leases [Line Items] |  |
Opening balance | 0 | 0
Derecognition for sublease | 0 | 0
Translation differences | 0 | 0
Closing balance | kr 0 | kr 0

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